| ASSERTION: Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half its partition, the rest of the half portion becomes more hot. |
| REASON: Resistance decreases due to decrease in temperature. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
The resistance of that half portion of the metallic wire (heated red hot) on which cold water is poured decreases due to fall in the temperature. This results in a decrease in the resistance of the entire wire. As a result, the current in the wire increases and the half portion become hotter than before.
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